Final answer:
The excretory system in humans consists of specialized organs such as the kidneys and bladder and focuses on removing urea from the blood, while flowering plants use mechanisms like transpiration to eliminate wastes such as oxygen and water vapor without specialized excretory organs.
Step-by-step explanation:
Differences Between the Excretory System in Man and in Flowering Plants
The excretory system in man is far more complex compared to the simple mechanisms employed by flowering plants. Humans possess a sophisticated set of organs comprising of the kidneys, ureters, bladder, and urethra, which work together to remove metabolic wastes, particularly nitrogenous wastes in the form of urea, from the blood and excrete it as urine. This system maintains the body's fluid and electrolyte balance and regulates blood pressure.
On the other hand, flowering plants do not have an excretory system like animals. They excrete oxygen as a byproduct of photosynthesis and excess water primarily through transpiration. Moreover, plants secrete metabolic wastes such as oxygen and water vapor through structures like stomata and lenticels, and other waste products may be stored in leaves that are eventually shed.
Tabular Comparison:
Characteristic Humans Flowering Plants
Organs Involved Kidneys, ureters, bladder, urethra No specialized organs; stomata, lenticels
Waste Products Urea, uric acid, creatinine Oxygen, water vapor, various organic compounds
Method of Excretion Urination Transpiration, guttation, abscission
Main Function Waste elimination, osmoregulation, blood pressure regulation Waste elimination, gas exchange
Note that flowering plants do not actively excrete nitrogenous wastes like animals. Instead, plants typically assimilate these compounds into other organic substances within their tissues.